<template>
  <section class="todoapp">
    <!-- 除了驼峰, 还可以使用-转换链接 -->
    <TodoHeader @addTask="addTaskFn" :list="list"></TodoHeader>
    <TodoMain :list="showList" @del="delFn"></TodoMain>
    <TodoFooter
      @changType="typeFn"
      @clearTask="clearFn"
      :type="getSel"
      :len="showList.length"
    ></TodoFooter>
  </section>
</template>

<script>
// 1.0 样式引入
import "./styles/base.css";
import "./styles/index.css";

import TodoHeader from "./components/TodoHeader";
import TodoMain from "./components/TodoMain";
import TodoFooter from "./components/TodoFooter";

export default {
  components: {
    TodoHeader,
    TodoMain,
    TodoFooter,
  },
  data() {
    return {
      list: JSON.parse(localStorage.getItem("todolist")) || [],
      getSel: "all",
    };
  },
  computed: {
    showList() {
      if (this.isDone === "yes") {
        return this.list.filter((item) => item.isDone);
      } else if (this.getSel === "no") {
        return this.list.filter((item) => !item.isDone);
      } else {
        return this.list;
      }
    },
  },
  methods: {
    addTaskFn(task) {
      // console.log('addTaskFn',task);
      this.list.push({
        id: this.list.length ? this.list.at(-1).id + 1 : 100,
        name: task,
        isDone: false,
      });
    },
    delFn(id) {
      // console.log(id);
      this.list = this.list.filter((item) => item.id !== id);
    },
    typeFn(type) {
      this.getSel = type;
    },
    clearFn() {
      // console.log('我要清除已完成');
      this.list = this.list.filter((item) => !item.isDone);
    },
  },
  watch: {
    list: {
      deep: true,
      handler() {
        localStorage.setItem("todolist", JSON.stringify(this.list));
      },
    },
  },
};
</script>
